Sulphur bearing ore furnace



Aug 22, 1933-. l. HgcHENBLElKNER 1,923,866

l SULPHUR BEARING ORE FURNAGE Filed ot. 26, 1929 2 sheets-sheet 1 AINVENTOR` e lngenum Hechenbmkner fly/6% ATTORNEYS Aug 22, 1933- 1.HECHENBLEIKNER 1,923,866A

SULPHUR BEARING ORE FURNACE Filed oct. 26,4 1929 2 Smets-sheet` 2INVENTOR lngenuin Hechenbkukner Y A TORNEYS Patented Aug. 22, 1933PATENT OFFICE- SULPHUB BEARING OBE FURNACE Ingennxn neenenbleikner,charlotte, N. signor, by mesne assignments, to

C., as- Chemical Construction Corporation, a Corporation of v i DelawareApplication october 26,1929. serial No. 402,595

This invention relatesto a furnace for burn- Y ing sulphur bearing ore,and has special reference to the provision of a furnace for oxicldizintgor burning' sulphur bearing ore fines or In mechanical furnaces forburning sulphur ore smalls, fines or dust now Iin use, the commlnuted orground sulphur bearing ore is fedin spread form through a series' ofhearths, and in said spread form is subjected to the action of 'anoxidizing medium such as air flowing through the hearths. Thesehearthsare com-v municatingly arranged horizontally one above 'the other; andthe feeding of the ore through the series of hearths is'- effected byfirst introducing the ore onto the bed of the uppermost hearth, by thenrabbling the ore over the bed ineither increasing or decreasing spirals,after r which the ore thus partly treated in one hearth vis dropped ontothe bed of the hearth therebelow, where the rabbling process and treatjment is continued, the ore lines going through a similar cycle in eachhearth section, the resulting cinders being collected in and ren'xoyedifrom the bedof the lowermost hearth section.A

For rabbling the ore, each hearth section is provided witha plurality ofrabble arms on whichm are mounted rabbling teeth, and the arms of allof` the hearth sections are usually fixed to a central motor drivenshaft which extends vertlcally through the mechanical furnace.

These mechanical furnaces for burning sulphur bearing ore lines orsmalls are attended in use with a. number of draw-backs ordisadizantages.' Due to the inherent design of these furnaces, thestructures are relatively large, particularly when built to yield arelatively large output or high capacity, and this results in ar-comparatively high initial or installation cost. In operation, thistype of furnace suffers some irregularities, due first to slagging andcintering of the ore which takes' place and which interferes with theoperation of the rabble arms, and due second to excessive dustproduction, which necessitates cleaning of the flues and lconsequentservice interruptions. To minimize slagging or fusing of the cinders,special constructions of rabbling means'have to be devised, and toovercome the troubleof excessive dust pro-- duction, the flue dust mustbe specially treated. .The regulation or control 'of the -concentrationI of the combustion gases is relatively difficult with these furnaces,the choice lying generally between the loss ,of sulphur in the cinderwith the consequent production of weak (ci. ca -27s) 4sulphur dioxidegases on the one hand, and the production of strong sulphur dioxidegases with the consequent incomplete reduction of the ore andsubstantial loss of sulphur in the resulting cinder on the other hand.

The prime object of my present invention centers about the provision ofa novel furnace for treating or burning sulphur ore fines or dustoperating on a principle different than that governing the operation ofthese known mechanical furnaces, and vin which the objections incidentto and inherent in the design and use of knowri` mechanical furnaces are.effectively obviated. In accordance with my present invention, thesulphur bearing ore fines or dust are ground or granulated to a degreeof iineness suchvtlat the same may be fed in a stream through a nozzlefor producing a spray of the l ore dust, the stream or/and spray beingintimate1y mtermixed with en oxidizing medimn 75 such as air conditionedto effect combustion of the ore spray and production of the sulphurdioxide gases. The-invention, therefore, has as its prime object theprovision of a furnace in which the ore is burned in spray form.

The desiderata in 'any sulphur burning process l is two-fold; `first, itis desired that the sulphur contained in the ore be burnt as faraspossible, thus resulting in eflicient reduction of th-ore, .85 andsecond, it is desired that the quantity of air or other oxidizing uid becontrollably such as to properly oxidize the sulphur tofsulphur dioxide,and such aS to effect the proper inter-4 mixture between the sulphurdioxide or combustion gases and additional air to produce a resultinggas mixture having a desired concentration depending upon the furtheruse to which the gases may be put. I have found that the desired orereduction, sulphur oxidation and gas '95 concentration may beeillciently obtained by burning the comminuted or pulverized sulphurbearing ore in stream or spray form, and I have found that this may beaccomplished by properly conditioning the atmosphere in which the i dustspray is burnt and by .suitably regulating or controlling thetemperature and the flow of the oxidizing and other air used in theprocess. The principal object of my present invention',` therefore,resides in the provision of .a spray sulphur burner constructed andydesigned for producing these results.

Further principal objects of the invention include the provision of asulphur burningfurnace in which the'ore is burned in the form of a 'uospray, and in which -the oxidizing vmedium or air is properlyconditioned by being pre-heated 4 to relativelyhigh temperatures throughheat exchanging relation with the combustion gases produced in thefurnace; the further provision of a sulphur burning apparatus of thisnature in which the ash or cinders produced inthe burning process arecollected without interfering with the proper operation of thecombustion zone of the furnace; the further provision of an ore sprayburning furnace provided with means for. suitably treating the cinder orash so as to prevent coagulation or fusion thereof and so as to permitefficient removal of the formed cinders in and during the continuingoperation of the furnace; and the further provision of a furnace of thiskind which is comparatively simple in construction, subject torelatively facile operation, and capable of easy regulation and control.

To the accomplishment of the foregoing and such other objects as willhereinafter appear, myl invention consists in the elements and theirrelation 'one to the other, as hereinafter. more particularly describedand sought to be defined in the claims; reference being had to theaccompanying drawings which show the preferred embodiments of myinvention, and in which:

Fig. 1 is a vertical elevational view partly in lcrass-section of asimplified form of the apparatus or sulphur burner of my invention,

Fig. 2 is a plan view thereof,

Fig. 3 is a vertical elevational view partly in cross-section of amodified form of the apparatus or burner, and

Fig. 4 is a plan view of this modified form.

Referring now more in detail to the drawings and having reference firstto Figs. 1 and`2 thereof, the sulphur burning furnace of my inventioncomprises a combustion chamber generally designated as A provided witha'means generally designated as B for introducing a spray of sulphurbearing ore fines or dust into the combustion chamber and foreffectingcombustion of said spray, thereby producing sulphur dioxide gases, anexit ue means generally designated as C for the combustion gases, and acollecting means generally designated as D for collecting the cinders orash produced in the combustion process.

The combustion chamber A comprises preferably a vertically elongatedunitwhich may consist of a cylindrical metal shell 10, which in the formof the invention shown in Figs. 1 and 2 is double walled to provide anintermediate air chamber for a purpose to be explained hereinafter, theinner wall 10a being interiorly surfaced with a lining 11 of fireresisting brick and the outer wall 10b being exteriorly surfaced with aheat insulating lining 12, both linings Gextending over the combustionend of the furnace or combustion chamber and terminating a distance fabove the bottom section D of the furnace, as

clearly shown in Fig. I1 of the drawings. The spray producing means B isarranged `at the top or the head of the furnace, the cinder collecting lmeans D is arranged at the lowermost region of the furnace, and the exitflue C for the combustion gases is preferably arranged adjacent thebottom of the combustion section of the furnace, and vtherefore at apoint intermediate the ends of the furnace. The furnace, if built for ay capacity to treat 500 pounds of ore fines or dust y per hour, may havean over-all height of about 30 feet and a diameter of 6 feet. The innerfire resisting brick lining functions to protect the furnace shell andto aid combustion by heat radiation, ,and the insulating lining 12functions to insulate the air space formed between the walls 10 and 10bof the furnace shell.

The sulphurA ore `fines or dust to be used with the furnace ispulverized or ground to a degree of fineness corresponding say to 60mesh, and a stream of this spray dust or fines is fed into thecombustion chamber at the top thereof through a nozzle 13, with whichmay communicate a feed pipe 14 extending from the nozzle 13 to a pumpingapparatus 15 located at a low level, and which pumping apparatus servesto feed the spray dust from a feed hopper 16 to and through the nozzle13. For effecting com- `bustion of the ore stream and for assisting ininjecting the same through the nozzle 13, a stream of oxidizing fluidsuch as air is introduced into the system by means of a valved pipe line17 at a point or region which may be considered the junction between thenozzle 13 and the feed pipe 14, as clearly shown in Figs. 1 and 2 of thedrawings. This stream of oxidizing air constitutes a primary iiow ofoxidizing medium. For effecting completion of the oxidation orcombustion and for producing additional air for intermixture with thecombustion gases so as to produce. resulting gases of desiredconcentrations, there is provided a secondary stream of oxidizing fluidor air which is introduced into the combustion chamber A in a regionsurrounding the ore stream or the spray produced. This secondary airstream is intrcduce'd through a conduit 18 into the head 19 at the topof the furnace, and moves from this head into and through a tube orcylinder 20 which surrounds the nozzle 13, the said tube being providedwith a plurality of circumferentially arranged holes or openings 2l forthis purpose.

Both the primary and secondary air streams are rst suitably conditionedto effect combustion of the sulphur ore; and to this end theA air ispreheated to relatively high temperatures, as for example about l000 F.Desirably the pre-heating of the air is effected by heat exchange withthe hot combustion gases, and this may be accomplished by designing thefurnace structure'so that a part thereof forms a heat exchangingapparatus for this purpose. In the construction shown in Figs.`1 and2,'this is accomplished by the double walled shell structurehereinbefore referred to, the space between the shell walls 10a and 10bforming a circulating passage for the air which is fed into the systemby means of a blower 22 communicating with the air space between theshell walls through an entrant opening 23 arranged adjacent the bottomof the furnace, and which air moves upwardly in said space, as shown bythe arrows on the drawings, the air being pre-heated to the desiredtemperatures by contact with the heated interior shell wall 10a of thefurnace. pre-heated air divides into the primary and secondary streams,the primary air stream piping 17 and the secondary air stream conduit 18being for this purpose connected to the arched top of the air space, asclearly shown in the drawings. The primary and secondary air streams maybe suitably controlled by means of the valve 24 in the piping 17 and thedamper structure 25 in the flue 18.

For minimizing or preventing coagulation or fusion of the cinders whichgravitate onto and collect upon the interior wall of the hopper- At thehead of the furnace this :,osasoe to provide cooling means for thiscollecting hopper D.l To this end the collecting hopper may be eitherwater or air cooled; and in the construction exemplied in Figs. 1 and2of the drawings, I utilize the circulating air o'f the system as thecooling means for the collecting hopper. It is for this reason that Iprefer to introduce the cool air at the nethermost portion of the hoppervthrough the entrant opening 23, the air in this region serving to chillor cool the inner wall 'of the collecting hopper and thereby functioningto minimize fusion diillculties. 'I'he air, as it rises in the air spacebetween the. walls of the furnace shell, is gradually heated, and theinner fire resisting brick lining 11 is made to terminate at a point orregion of the furnace so as to permit suilicient pre-heating of the airto the desired high temperatures. The outer insulating lining 12, itwill now be understood, functionsto prevent heat loss of the pre-heatedair. The ash' or cinder is removed through a discharge passage 26.

In the modiiication of the invention shown in Figs. 3 andl of thedrawings, the oxidizing air is pre-heated by heat exchange apparatuswhich is separated from the furnace proper, the heat exchange apparatusfunctioning, however, for utilizing heat of the combustion gasesfor'eilecting the pre-heating of the oxidizing medium. The-furnacestructure in this modication may then comprise a vertically elongatedpreferably cylindrical metal shell surfaced interiorly 'with a liningl1' of nre resisting brick laid onto an inner lining 27 of insulatingmaterial and forming the combustionchamber generally designated as A.The head or top of the furnace is constructed similarly to that alreadydescribed in connection with Figs. land 2 ofthe drawings, in which headis mounted the ore spray producing means generally designated as B', andthe bottom of the furnace forming the hoppershaped cinder collectingreceptacle generally designated as D' is lalso constructed in a mannersimilar to that already described in connection with the construction ofFigs. l and 2 of the drawings, and is provided with a cooling chamber orcompartment 28 surrounding the cinder hopper, into which compartmentcooling air news from an entrant opening 29 and out of an exit opening30.

Similar to the construction already described, the ore is lintroducedthrough a nozzle 13 communicating with a feed pipe 14 which is connectedto a` combination hopper and pump mechanism 15', 18. y l The'heatexchange means in this modified 'form of the invention comprises a bricklined .chamber 31 in which are arranged a plurality of U-shaped tubes32, one end of each of which communicates with 'an air entrant head 33and 'the other end ofeach of which communicates withan air exit head,34, both heads forming parto! the chamber structure., The chamber 3 1has a combustion gas entrant ilue 35 which communicates directly withthe furnace chamber A and has a combustion gas exit flue 364 adjacentThe combustion gases produced in the furnace chamber A'imove through the'same and through the heat exchange chamber in the manner indicated bythe run-mowed unes in tue drawings. 'rhefir for the system `is forcedbymeans of a blower apparatus 22 through a stand pipe or conduit 31 and'into the air entrantihead as, the einen lmoving-fromV this head throughthepiping s2 and into the air outlet head 34. From this air outlet orexit head the air may be divided into the two streams, the primarystream moving through the piping 17 and the secondary stream movingthrough the conduit 18', this piping and conduit vbeing connected intothe furnace system in a manner similar to that heretofore described inconnection with the construction of Figs. 1 and 2 of the drawings and bymeans identified by similar and primed reference characters. The now ofthe air through the stand pipe heat exchangechamber andinto the furnaceis in dicated by the arrows in Fig. 3 of the drawings. By the meansdescribed, the combustion air can be preheated to any temperaturebetween 400 and 1000 AF., the desired temperature of the pre-heated airat the nozzle of the furnace being preferably about 1000 F. Forregulating the temperature of the hotor heated air into the air chamberor tube 20' around the spray nozzle 13.', hiere is provided the valveclbypass38 connecting the stand pipe 37 with the secondary air conduit18'. For further controlling the air flow a valve 39 may be provided inthe conduit 18'. `z In both modications of the invention, .the ore dustor fines is introduced into the furnace .chamber in the form of a spraywhich is oxidizedor burnedvin an atmosphere of pre-heated air. This airis pre-heated by heat exchange with the hot combustion gases either inthe fur` 1 nace proper or in apparatus auxiliary to or separate from thefurnace structure. The oxidizing medium or air ispreferably' dividedinto streams so as to carry out a completion of the oxidation, therebyminimizing sulphur loss in the resulting cinders and thereby effectingmaximum oxidation of the sulphur, the fiow of the streams being soregulated or controlled as to permit the obtaining of sulphuridioxidelgases of! desired concentration or atrength.` 'I'he cinder isreadilycollected and removed, and is so treated as to coagulation troubles.\The apparatus in either form of the invention is oi`rela' tivelyrvsimple design and may be built at a ccmparatively small or lowinitialcost? The apparatus may be readily regulated and easilylcontrolled, and may be repaired at small cost. Other advantages will beobvious to those skilled in the art;

While I have shown and described my lnvention in the preferred forms, itwill be apparent that other changes and modifications may be made in thestructure disclosed without departing from.. the spirit of theinvention, deiined in the following claims.

I claim:

, 1. A furnace for burning sulphur orev to produce 'sulphur dioxide forsulphuric acidl a combustion chamber,

4manufacture comprising bearing means for producing a spray of sulphurore fines and introducing rsaid spray into vcombustion--chamberyimeansto pre-heat the oxidizing medium by means of the heat'of combustion ofthe sulphur ore, and means for in-f troducing the thus heated oxidizingmedium into comixing' relation combustion ot-"said ore' and for the,production oi' sulphur dioxide gases.

2. A furnace for burning sulphur ore to produce sulphur dioxideforsulphuric acid said with said spray; for'.

manufacture comprising a combustion chamber,

means-for introducing a spray'of sulphur bearing ore mies L into saidcombustion chamber. :means for introducing an medium-into co-mixingrelation with said spray for combustion. of said spray thereby producingsulphur dioxide gases, and means arranged in heat exchange relation withthe combustion gases for preheating the oxidizing medium.

3. A furnace for burning sulphur bearing ore to produce sulphur dioxidefor sulphuric acid manufacture comprising a combustion chamber, meansfor introducing a spray of sulphur bearing ore fines into saidcombustion chamber, means for heating an oxidizing medium to relativelyhigh temperatures, and means for introducing the said heated oxidizingmedium into co-mixing relation with said spray for combustion of saidspray and for the production of sulphur dioxide gases.

4. A furnace for burning sulphur bearing ore to produce sulphur dioxidefor sulphuric acid manufacture comprising a combustion chamber, meansfor continuously feeding a stream of sulphur bearing ore ilnes into saidcombustion chamber, means for 'injecting an oxidizing medium directlyinto said ore stream, and means for introducing additional oxidizingmedium into said chamber in a stream surrounding said ore stream.

5. A furnace for burning sulphur bearing ore to produce sulphur dioxidefor sulphuric acid manufacture comprising a combustion chamber, meansfor continuously feeding a spray of sulphur bearing ore fines into saidcombustion chamber, means for injecting anair stream di- -rectly intosaid ore spray, means for introducing additional air into said chamberin a stream surrounding said ore spray, and means for preheating saidair streams to relatively high temperatures.

.6. A furnace for burning sulphur bearing ore lto produce sulphurdioxide for sulphuric acid manufacture comprising a combustion chamber,

i means for continuously feeding a spray of sulA phur bearing ore finesinto said combustion chamber, means for injecting an air stream intosaid ore spray, means for introducing secondary' air into said chamberin a stream surrounding said ore spray, means for controlling said airstreams to'eifect combustion of said ore and prc-^ duction of sulphurdioxide gases of predetermined concentrations, and means arranged inheat exchange relation with said combustion gases for preheating atleast one of said air streams to relatively high temperatures.

'7. A furnace for burning sulphur bearing ore to produce sulphur dioxidefor sulphuricY acid manufacture comprising a vertically elongatedcombustion chamber including top, intermediate, and bottom portions, aspray nozzle arranged at the top portion of said combustion chamber,"

means for -feeding a stream of sulphur bearing ore fines into said spraynozzle and producing a spray of said lore nes, means for intermixing aheated oxidizing'medium with said stream of ore fines lfor combustion ofsaid spray and for the production of sulphur dioxide gases, means at theintermediate portion of said combustion chamber' defining an exit forthe combustion gases, and the bottom portion of said combustion chamberbeing arranged for lcollecting and discharging the ore cinders.4

8. A furnace for burning sulphur bearing ore to producesulphur dioxidefor sulphuric'acidIy manufacturel comprising a vertically elongatedcombustion chamber including top, intermediate,

and bottom portions, a spray nozzle arranged' combustion of said sprayand .for the production of sulphur dioxide gases, means at theintermediate portion of said combustionA chamber defining an exit forthe combustion gases, the bottom portion of said combustion chambervbeing arranged for collecting and discharging the ore v cinders, andmeans for cooling said cinder collecting portion to prevent fusion ofsaid cinders. 9. A furnace for burning sulphur bearing ore to producesulphur dioxide for sulphuric acid manufacture comprising a verticallyelongated ,-v.

combustion chamber including top, intermediate,

andvbottom portions, a spray nozzle arranged at the top portion of saidcombustion chamber, means for feeding a stream of sulphur bearing orefines into said spray nozzle and producing a spray of said ore fines,means for introducing a stream of heated air with said stream of orefines for combustion of said spray and'for the production of sulphurdioxide gases, the bottom portion of said combustion chamber beingarranged for collecting the ore cinders, and means for cooling saidcollecting portion to prevent fusion of said cinders and-for heatingsaid air stream by causing heat exchange therebetween.

'1 0. A furnace for burning sulphury bearing ore to produce sulpurdioxide for sulphuric acid manufacture comprising a vertically elongatedcombustion chamber including top, intermediate,

and bottom portions, a spray nozzle arranged at thev top portionof saidcombustion chamber, means `for feeding la stream of sulphur bearing orenes into said spray nozzle and producing a spray of said ore fines,means for introducing a manufacture comprising a vertically elongatedcombustion chamber including top, intermediate, and bottom portions, aspray nozzle arranged at the top portion of said combustion chamber,means for feeding a stream of sulphur bearing ore fines intosaid spraynozzle and producing a spray of said ore fines, means for introducing astream of an oxidizing medium into said stream of ore fines and forintroducing a secondary 0x1-- dizing medium into said chamber into alstream surrounding said spray, said streams of oxidizingA mediumfunctioning for combustion of Vsaid ore spray and for the production ofsulphur dioxide gases of desired concentrations, heat exchange meansutilizing heat of said combustion gases Afor pre-heating'` said streamsof oxidizing medium to relatively highvtemperatures.

and means to cool the bottom portion-ofsaid'- combustion chamber forcollecting the ore cinders.

to produce sulphur dioxide for sulphuric acid manufacture comprising avertically'elongated combustion chamber including top, intermediate, andbottom portions. a spray nomle arranged at the top portion of saidcombustion chamber,

12. A furnace for burningsulphur m T means for feeding a stream ofsulphur bearing ore nes into said spray nozzle and producing a spray ofsaid ore fines, means for introducing a stream of an oxidizing mediumwith said stream of ore fines for combustion of said orev spray and fortheproduction of sulphur dioxide gases, means arranged at theintermediate portion of said combustion chamber dening an exit for saidcombustion gases, heat exchange means utilizing heat of said combustiongases for' preheating said stream of oxidizing medium to relatively hightemperatures, the bottom portion of said combustion chamber being shapedto act asa hopper for collecting the ore cinders, and means fory coolingsaid hopper or bottom portion. y

13. A furnace fory burning sulphur bearing ore to produce sulphurdioxidev for sulphuric acid manufacture comprising a verticallyelongated combustion chamber including top, intermediate', and bottomportions, a spray nozzle arranged at the top portion of Asaid combustionchamber, means for feeding a stream of sulphur bearing ore fines intosaid spray nozzle and producing a spray of said orelines, means forfeeding a stream of air with said stream of ore fines for combustion ofsaid spray in order to produce sulphur dioxide gases, means at theintermediate portion of said 'combustion chamber defining an exit forthe desired combustion gases, the bottom portion of Vsaid combustionchamber being arranged for collecting and discharging the'ore cindersand impurities remaining after the combustion of the sulphur.

14. A furnace for burning sulphur bearing ore to produce sulphur dioxidefor sulphuric acid manufacture, comprising a' vertically disposedgreatly elongated combustion chamber including top, intermediate, andbottom portions,

means at the top portion of said combustion chamberfor feeding sulphurbearing ore fines into said combustion chamber, means for introducingastream of an oxidizing medium into said chamber for combustion of `said4ore and for the production of sulphur dioxide gases, an exit duct f orthe combustion gases at the intermediate portion of thechamber, thebottom portion of said chamber being shaped to act as a hopper for thecollection and discharge of ore cinders.

l5. A furnace for burning lsulphur bearing ore to produce sulphurdioxide for sulphuric acid manufacture, comprising a vverticallydisposed greatly elongated combustion chamber including top and bottomportions, means at the top portion of said combustion chamber forfeeding sulphur bearing ore iines into said combustion chamber, meansfor introducing a stream of an oxidizing medium into said chamber forlcombustion of said ore and for the productionof sulphur dioxide gases,the bottom portion of said chamber being shaped to act as a hopper forthe collection and discharge of ore cinders, and means to cool thebottom portion of said combustion chamber.

16. A furnace for burning sulphur bearing ore to produce sulphur dioxidefor sulphuric acid manufacture, comprising a vertically disposed greatlyelongated combustion chamber including top, intermediate, and bottomportions, means at the top portion of said combustion chamber forfeeding sulphur bearing ore nes into said combustion chamber, meansforintroducing a stream of an oxidizing medium into said chamber forcombustion of said ore and for the production of sulphur dioxide gases,an exit duct for the`combustion gases at the intermediate portion of thechamber, the bottom portion of said chamber being shaped to act as ahopper for the collection and discharge of ore cinders, and means tocool the bottom portion of said combustion chamber.

17. A furnace for burning sulphur bearing ore to produce sulphur dioxidefor sulphuric acid manufacture, comprising a vertically disposed greatlyelongated combustionchamber 'including top, intermediate, and bottomportions, means at the top portion of said combustion chamber forfeeding sulphur bearing ore fines into said combustion chamber, meansfor introducing a stream of an oxidizing medium into said chamber forcombustion of said ore and for the production of sulphur dioxide gases,an exit duct for the combustion gases at the intermediate portion ofthechamber, the bottom portion of said chamber being shaped to act as ahopper for the collection and discharge of ore cinders,

-at ,the top portion of said combustion chamber for feeding sulphurbearing ore fines into said combustion chamber, means for introducing astream of an oxidizing medium into said chamber for combustion of saidore and for the -production of sulphur dioxide gases, and an exit ductfor the combustion gases at the intermediate portion of the chamber. thebottom portion of said chamber being shaped to act as a hopper for thecollection and discharge of ore cinders, said bottom portion beingprovided with heat exchange means for bringing the oxidizing medium intocontact therewith, in order to preheat the oxidizing medium and cool thebottom portion.

mGENUm HEcnENBLEmNER.

disposed 1,923,866.Ingenuin Hechenbleikner, Charlotte, N. C. SULPHURBEARING ORE FURNACE. Patent dated August 22, 1933. Disclaimer filed May21, 1935,

by the assignee, Chemical Construction Corporation. f Herebyenters thisdisclaimer to claims 3, 7, 13, and 14 of said patent reading as o ows:

3'. A furnace for burning sulphur bearing ore to produce sulphur dioxidefor sulphuric acid manufacturecomprislng a combustion chamber, means forintroducing a spray of sulphur bearing ore fines into said combustionchamber, means for heating an oxidizing medium to relatively hightemperatures, and means for introducing the said heated oxidizing mediuminto co-mixing relation with said spray for combustion of said spray andfor the production of sulphur dioxide gases.

7. A furnace for burning sulphur bearing ore to produce sulphur dioxidefor sulphuric acid manufacture comprising a vertically elongatedcombustion chamber including top, intermediate, and bottom portions, aspray nozzle arranged at the top v 'ortion of said combustion chamber,means for feeding a stream of sulphur bearing ore fines, means forinter-mixing a heated oxidizing mediumwith said stream of ore nes forcombustion of said spray and for the production of sulphur dioxidegases, means at the intermediate portion of lsaid combustion chamberdefining an exit for the combustion gases, and the bottom portion ofsaid combustion chamber being arranged for collecting .and dischar ingthe ore cinders.

' 13. A furnace for burning suphur bearing ore to produce sulphurdioxide for sul huric acid manufacture comprising a vertically elongatedcombustion chamber inciuding top, intermediate, and bottom portions, aspray nozzle arranged at the top portion of said combustion chamber,means for feeding a streamV of sulphur bearing ore fines into said spraynozzle and producing a spray of said ore fines, means for feeding astream of air with said stream of ore fines, means for feeding a streamof air with said stream of ore fines for combustion of said spray inorder to roduce sulphur dioxide gases, means at the intermediate portionof said combustion c amber defining an exit for the desired combustiongases, the bottom portion Vof said combustion chamber being arranged forcollecting and discharging the ore cinders and impurities remainingafter the combustion of the sul hur.

` 14. A furnace for burning sulphur caring ore to produce sulphur diozdefor rsulphuric acid manufacture, comprising a vertically disposedgreatly elongated comt bustion chamber including top, intermediate, andbottom ortions, means at the top portion of said combustion chamber forfeeding sulphur earingore fines into said combustion chamber, means forintroducing a stream of an oxidizing medium into said chamber forcombustion of said ore and for the production of sulphur dioxide ases,an exit duct for the combustion ases at the intermediate portion of thechamr, the bottom portion of said cham r being shaped to ac t as ahopper for the .collection and discharge of ore cinders.-1

.Gazette June 18 1935.]

